Benzyne as a monomer for polymerization: Alternating copolymerization of benzyne and pyridine to give novel polymers with o-phenylene and 2,3-dihydropyridine units in the main chain

Macromolecules

Volumn 38, Issue 6, 2005, Pages 2167-2172

  Ihara, Eiji ^a   Kurokawa, Atsushi ^a   Koda, Takeshi ^a   Muraki, Takahito ^a   Itoh, Tomomichi ^a   Inoue, Kenzo ^a  

^a EHIME UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ALKALINITY; CHEMICAL REACTIONS; FLUORIDE MINERALS; MONOMERS; NEGATIVE IONS; NUCLEAR MAGNETIC RESONANCE; POLYMERIZATION; PROTONS; SODIUM COMPOUNDS;

ADDITION POLYMERIZATION; ALKALINE TREATMENT; CYCLIC STRUCTURES; ELEMENTAL ANALYSIS; MAIN CHAIN;

BENZENE;

EID: 15944414750     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma048668b     Document Type: Article

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16. As one of the reviewers pointed out, the deep purple color of the copolymers in this study is strange for their chemical structures, and it was suspected that the color derived from oxidation of the nitrogen moiety. However, the copolymerization under thoroughly deoxidized conditions gave the same results with respect to the color and the polymerization behavior. Thus, the origin of the intense color of the copolymers is not clear at present.
17. 1H NMR spectra of the copolymers. As broadening of the observed signals in the spectra indicates, the main chain structure of the copolymers should be highly rigid. We suppose that ring current effects of the aromatic rings in the rigid main chain conformation might cause the disappearance of the signals.